What about rice seedling disease? Rice seedling disease is commonly known as male rice. Once it appears to affect the normal growth of rice, the following is a detailed explanation of the causes and control measures of rice seedling disease.
â€ä¸€, the law of incidence
The pathogens can be overwintered mainly by conidia attached to the surface of the seed or by the mycelium latent in the seed, and the mycelium and straw grown ascospore that are latent in the straw in winter. The pathogen is mainly transmitted by diseased seeds. After the diseased seeds are spread, the seedlings will suffer. The pathogen spreads in the semi-system of the plant, and the secretion of gibberellin stimulates cell elongation, causing it to grow. Mycelium of unfertilized diseased straw can also cause disease. Honda's long-term conidia spread by wind and rain, causing reinfection from plant wound invasion.
Second, the onset of symptoms
It can occur from the seedling stage to the heading stage. At the seedling stage, nearly 1/3 of the plants were thinner than the healthy plants, the leaves were narrow, the leaf sheaths were elongated, the leaves were pale green, the roots were poorly developed, the number of root hairs was reduced, and sometimes the roots were excessively divided. Death before planting or after transplanting. After being inserted into Honda, the diseased plants appeared in a month or so. The symptoms were similar at the seedling stage, with little or no tillering, significant elongation between the nodes, and the emergence of leaf sheaths at the nodes, which grew many adventitious roots, especially at the base. It is a feature of this disease.
Third, the period of disease
1. Bacterial source: It is necessary to select rice varieties with less pathogenic bacteria. The higher the seed carrier rate, the heavier the disease, but the disease is not a quarantine disease.
2. Environment: The temperature of the pathogen is 35 °C-31 °C, which is most suitable for inducing growth. Above 40 °C or below 2 °C, it can not grow.
3, management: germination temperature is too high, seedling bed high temperature management is more serious.
Fourth, control methods
1. Self-control: Purchase qualified seeds with varieties with less germs.
2. Chemical control: Soaking seeds with carbendazim, dithiocyanomethane, and imidate alone has not achieved the effect of preventing and curing disease. It is recommended to use 25% cymene suspension (Jingshou) to soak seeds.
3, the occurrence of mite disease: seedling bed disease prevention and control methods, it is recommended to spray on the seedbed after dilution, you can control the disease.
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